Locking device for mantle nuts



Oct. 20,1925. 1.557.951

' W. S. WESTON LOCKING DEVICE FOR KANTLB I'UTS Filed July 19. 1922 ment with the shaft, to prevent the mantle Patented Oct. 20, 1925.

PA T:

ILLIAM s. WESTON, or COLUMBIA, scorn CAROLINA.

LOCKING DEVICE FOR MANTLE mrrs.

Application filed July19, 1922. SerialNo. 576,146.

To all whom it may concern:

Be it known that I, WVILLIAM S. WEs'roN,

a citizen of the United States, and residing at Columbia, Richland County, State of" South Carolina, haveinvented certain new and useful Improvements in Looking Dev vices for Mantle Nuts, of which the following is a specification.

The present invention relates to gyratory crushing. machines and particularly to means for preventing jamming of the p y I form of a frustrum'of a cone, ispressed mantle nuts of'such machines. I

In gyratory crushing mach nes it is customaryto provlde, above the mantle of the crushing cone secured to the -main gyratory shaft, a mantle nut having threaded engagefrom moving vertically upward, and to pro tect the upper end of the mantle from being injured by the stone passing downwardly through the machine. It has been frequently found, in caseswhere the annular lower edge of the mantle nut has had full hearing on the annular upper edge of the mantle, that due to the action of'the stone on the nut as the shaft gyrates, the nut has been turned down so tightly that its removal by unscrewing has been impossible. In such cases it is necessary to cut away. the mantle nut when the the mantle is to be re-, moved and to replace it by a new one. This involves considerable loss of time and the cost of a new nut. I

It is the object of the present invention to provide means to be interposed between the vmantle and mantle nut whereby the full holding power of the nut on the mantle is retained, but which prevents the nut from being ammed on the mantle tosuchv anextent that its removal cannot easily be ac-v complished. The means employedconsists H in a series of members having surfaces -adapted to bear against the lower edge of e the mantle nut and against the upper edge of the mantle to prevent seating of the mantle nut on the mantle so that these mem} bers are separated, when the nut has been screwed into position, by a small annular gap and the nut is positively locked to the mantle in such manner as to keep the latter tight on the shaft. I

One formv of the invention is illustrated in the accompanying drawings and described in the following paragraphs, by way of example.

In the drawings: 7 r a r Fig. 1 isv a side elevation, .pa-rtly broken away, of the'up'per end of the crushing cone of a gyratory crusher showing the --mantle, mantle nut, and the manner, in which upon the shaft 10 so as to be rigidlyunited therewith. The' inside surface of the mantle 11- is similar to the external surface of the core 10, but the cone, formedby the'formen space is entirely filled by thezinc layerj13 thus securing the mantle to the core and shaft." .The mantle nut 12 has a right hand thread and is in threaded engagement with the-threaded portion 14; of the shaft. ,The nut is frustro-conical in shape and has longitudinal ribs15 on its outer surface so that wrenches or special tools may grip the same.

to effect its rotation on the shaft. Thenut has a plurality of notches or recesses 16 having inclined upper edges 17 and the upper edge of the mantle llis provided with a plurality of recesses 1 8 the recesses 16 and 18 being in register, as shown inFigure 1, when thenut 15 is in position. Aplurality of keys 19 extendinto these registering recesses, these keys having infclinedsurfaces '20 to: bear againstsurfaces, 17 of the mantle. nutandh'aving surfaces is somewhat' larger, and the intervening to bear against. the walls of recesses 18.] The keys are also: providedfwith" tongues or extensions 21 extending downwardly, as

shown inFigu-re '3 c and in do'ttedjlinesfin Figure 1, in rear of the mantle sothat the" keys, cannot bedisplaced accidentally. f

The keys 19. preventlthe annular bearing surface of the nut from contacting with the annular upper surface of tl1e'mantle,}all of the pressure between the mantle and the nut beingtaken upon: the,.upper slope of the wedge .19. Jamming ofthe nut upon the mantle is thus prevented, and the. great reduction in the contactingarea of the nut;

renders it much easier to remove- When v1t 1s desired to remove the nut, 1t is only necessary to strike 1t a few IbloWs with a driving bar and sledge hammer in'fadirection opposite to that of the 'arrow AfoflFig.

to dontact with the loweredge of the mantle '15 "hit. "As a full [contact between the f zinc andfnilantle nae'woaid render it difficult" to frniove' the iiiit; I; provide an" annular -gro ove "122"in thetlovver edge of the" mantle n'ut'and I: 'fdiretly over the annular upper edge of the "'2o7'zineffiilr, fTheainc' wi1l"not"flow into this l fgrdoveand the i'na'n tle nut will thus prevent f he 111c 'froin escaping' without being mateI rally jboundther'eby against turning.

WVhentthecrushingmachine is in operaon;thefshaftisfgyrated by an eccentric in otwnbn tlie to'pbtthe machine. This "caflses' af'sligl t rotation of the shaft-fin a ftouhter-elobliwisddirection, as shown the BWEidivvfi-A. 'of Fig. 1. "Theicrushingpf the v f'jrf ick," weeni the mafntle and the frame of 'the ine, iwweyergresists this rotation ghly "ti ht on" "the "core, such 1 slippage ine; as eilrbe ut matica y i tewl" i clockwise directionms'seen "when looking thereby rendering the nut much easier to remove. "Second, the keyslock thenut to the mantle soas to -force it to move with the --mant-le during any creeping movement of the latter;therebyautomatically re-tightening the mantle on the core.

Toone-skilled in the art the advantages of the key locking device above described will be apparent, and it will also be obvious that the parts may be designed in difierent ways without-departing from the'scope of theinvehtion.

Having thus described "the invention an at Y is claimed-as new and "desired to be' se'cur'ed by Letters Patentis: I *8 -1 1 In "a -device of the class described, in combination, a sha ft' having a threaded portion, a mantle mounted-on the shaft; a mantle nut -having threads interengaging *withthe threads on the shaftyand-a device interposed between the nuta-nd -mantle; -sa= id device preventing "contact of I the mantle and nut and cau-sing the nut t0 move with themantle during movement of one direction; 1

2. 5 In Pa- "device of the olass described; in combination, a sha ft having-a threaded portion, a mantle mountede-on the shaft,- amantle nut having threads interengaging with the-threads on the shaft, and a device interposed between the nut and mantle,- said '-*device having-a wedge shapedporti-on, the faces of which bear against the I mantle and --nut respectively; and said device preventing contact of the 'mantle'- and mit.

- 3. 5 In a device of the Class describ theiatter in leombinati-on, a shaft having a threaded --p ortion -=a m'antle mounted on the" shait, a

vice "interposed betwen P the n-ut and man tle,

said device having a portion interlocking with the mantle so as to be heid fagainst movement eircumfea'entially bf =thez mantle,

? and *preventing =eo'ntact of the I mantleand *htjereepingjwill take pla cebe-fi nut'andfioeking the nut to the nra ntle iso that-*the two move t0;, 1;ether whenever' the 1 latter oreeps -upon the shaft; the nut and 'sh a ft -being'so' threaded that this movement results in a -=tighteningof "the mantle: npon"* 4 4L? In a device of'fthe class i deseribed; in -'combinat-ion, a sha'it-having a threaded p'or- "tion a mantle mounted' on' the shafty a -mantle' nut having' threads interengaging w'ith"=the threads on the shaft; and a" device interp'osed between the nut and man'tle5- isaid device having a surface inclined to a plane at *right*arigles to the aXis of (the shaft "adapted to b ear *against a corresponding in clined surface of the -nut,=-and preventing contact* of the n'ut andmantle. I

55111- a device of the -.'elass= deseribed;i in combination? a shaft-having a threaded portion, a mantle mounted on the shaft and having a recess in its upper edge, a mantle nut having threads interengaging with the threads on the shaft and having an elongated recess in its lower edge and a wedge device insertable into said recesses when in register for holding the mantle and nut out of contact.

6. In a device of the class described, in combination, a shaft having a threaded portion, a mantle mounted on the shaft, a soft metal lining between the mantle and the shaft, and a mantle nut having threads interengaging with the threads on the shaft, said nut having an annular lower end surface and an annular groove in said lower end surface in position to reduce the surface of said mantle nut bearing on said soft metal lining, as and for the purpose described.

WILLIAM S. WESTON. 

